Density and viscosity meters operate on a vibrating-element principle, where vibration frequency is inversely proportional to fluid density. Viscosity meters build on this principle by measuring additional frequency characteristics to determine liquid viscosity. All density and viscosity meters include internal temperature measurement to compensate for changes in metal stiffness due to temperature fluctuations.

Density and viscosity are important process variables used to measure product quality, perform mass-to-volume conversions, optimize efficiency, identify product interfaces, and more, through densitometers and viscometers. These measurements are essential wherever the value, quality, or composition of a liquid, gas, or slurry is crucial. In short, density and viscosity measurements help identify a liquid, gas, or slurry, determine its quantity, and verify its composition and accuracy.

Densitometers and viscometers are essential for any liquid, gas, or slurry process involving custody transfer, interface detection, blending, separation, evaporation, or product change. Whether measuring crude oil density, the concentration of a caustic cleaning solution, or the sugar content in a sugar-water mix (degrees Brix), these meters help drive revenue by improving consistency, reducing waste, and enhancing customer perceptions of quality. Many processes rely on fluid density and viscosity measurements to boost productivity and throughput.